Vacuum Induction Melting


Vacuum melting, casting and re-melting equipment have been implemented in huge numbers over the recent years mainly with an intention to try and eradicate impurities from the process wherever possible.
Vacuum induction melting (VIM) has some specific advantages including, gas elimination, chemical composition control, process control and more.

In recent years the world of metallurgy has seen a massive growth in installations of new melting, re-melting and casting equipment under vacuum. This development is driven by various factors, but mainly by the increasing demand from the aerospace and power turbine industries, which pursue the simple philosophy: “Impurities that are not generated do not have to be removed.”

This means, especially for materials which are used in rotating parts under high thermal stress, that cleanliness is very important and influences the lifetime of such parts. For example, low cycle fatigue (LCF) properties of turbine disks can be directly related to both non-metallic inclusion content and inclusion size of the material. In aircraft and land based gas turbines, most parts and components (eg, turbine blades and vanes, turbine disks, cases, shafts, bolts and combustors) that undergo high thermal stress during operation, are made of superalloys with different amounts of alloying elements.

Most of these alloying elements have a high affinity for oxygen, nitrogen and hydrogen, therefore, during melting of such alloys under air, formation of oxides and/or nitrides will occur. These oxides have a dramatic influence on mechanical properties of the materials. To minimize or avoid the formation of inclusions, it is therefore necessary to protect the melt from contact with air.

Vaccum Induction Melting (VIM) is the melting of metals by induction done under a vacuum. This process first became important in the1950s; As a result of VIM, the jet engine made the great advance in performance and durability which has been so important to both military and commercial aviation.


The specific advantages of vacuum induction melting include:

  • Elimination of gases - under the very low pressures obtained, .000001 atmosphere, undesirable gases and potentially harmful volatile elements are eliminated from the charged raw materials as melting occurs
  • Close control of chemical analysis - exceptional and reproducible control of reactive element containing compositions is possible because of the lack of atmosphere
  • Superior process control – independent control of pressure, temperature and inductive stirring provides an exceptional opportunity for developing melt practices specifically tailored to alloy composition and desired properties
  • Slag free melting - melting in a vacuum eliminates the need for a protective slag cover and decreases the potential of accidental slag contamination or inclusions in the ingot
  • Melt protection - high vacuum prevents deleterious contaminating reactions with atmospheric gases

What is Vacuum Induction Melting Used For?

Some applications of vacuum induction melting are:

  • Refining of high purity metal and alloys
  • Electrodes for remelting
  • Master alloy stick for processes such as investment casting
  • Casting of aircraft engine components

Figure 1: Processing routes for superalloys and high quality steels

기술 자료 검색

검색할 어구를 입력하십시오:

검색 범위



물리적 특성은 Total Materia 데이터베이스 내 많은 재질에서 검토하실 수 있습니다.

데이터는 규격의 공식 정보와 Total Materia의 강력한 상호 참조 표를 통해 검색 가능하며 이는 물리적 특성 데이터 검색에 매우 효과적일 것입니다!

신속 검색에 검색할 재질명을 입력합니다. 원하신다면 국가/규격을 지정하신 후 검색 버튼을 클릭합니다.

관심 있는 재질을 선택하신 후, 물리적 특성 링크를 클릭하셔서 선택된 재질의 데이터를 검토합니다. 물리적 특성 데이터 기록의 개수는 링크 옆에 괄호 안에 표시됩니다.

물리적 특성은 원래 데이터 값에 따라 표시됩니다. 규격에 의한 공식 데이터는 공식 탭에서 찾을 수 있고, 다른 출처를 통해 검색된 재질의 데이터는 자신의 탭에 표시 됩니다.

유사 재질 탭에는 원래 재질과 비슷하며 물리적 특성이 포함된 재질을 표시합니다. 등가 재질 검색 시에 매우 유용할 수 있습니다!

일반 탭은 특성 데이터에 대한 일반적인 개요를 제공하며 추가 조사를 위한 유용한 출발점으로 사용될 수 있습니다.

Total Materia 데이터베이스를 사용해 보실 수 있는 기회가 있습니다. 저희는 Total Materia 무료 체험을 통해 150,000명 이상의 사용자가 이용하고 있는 커뮤니티로 귀하를 초대합니다.